"We urge the Government to immediately and unconditionally provide Nazanin Zaghari-Ratcliffe and Narges Mohammadi with access to the appropriate treatment and care they have repeatedly requested in light of their serious health concerns," said the experts, adding that the denial of proper health care compelled the two women to start a hunger strike in protest.

"The authorities must urgently address the violations that are the basis of their hunger strike protest, including denial of appropriate treatment and care, which may well amount to cruel, inhuman or degrading treatment, or even torture," the experts stated.

Zaghari-Ratcliffe, a British-Iranian dual national, was arrested in 2016 without access to a lawyer and sentenced to five years in prison after being convicted of being a spy for an illegal group.

British Foreign Secretary Jeremy Hunt had summoned the Iranian ambassador last week to discuss the imprisonment of Zaghari-Ratcliffe.

Narges Mohammadi, an Iranian human rights activist was arrested in May 2015 on the charge of 'founding an illegal group'.